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Pacific Coast Recreation - 2 - 12 November 2020 Aka Cohn Property 3755 Mumford Avenue Stockton, San Joaquin County • On page 8, Apex states depth to groundwater varies between 48 to 55 ft bgs, however during the second quarter 2020 depth to water ranged from 43.43 to 44.88 ft bgs. On page 8, the section titled Well MW -16 states: "Second water zone (deep water), total depth is anticipated between 75 to 80 ft bgs. Utilizing an 8 -inch hollow stem auger, advancing the augers 10 feet into the water bearing zone. Casing -2 -inch Sch 40 PVD, with screen -0.02 -inch bottom 10 feet with end cap. Sand Pack #3 Sand from base of boring to two feet above top of slot, 2 feet of hydrated bentonite seal on top of sand pack, with neat cement seal to surface. Surface protection will be a concrete reinforced flush mounted traffic box. " Based on the existing well network, wells screened to a depth of 80 ft bgs have historically been referred to as shallow wells, while deep wells are screened between 83 and 146 ft bgs. • On page 9, Apex proposes to collect soil samples at five foot intervals from 65 ft bgs to at least 80.5 ft bgs, and to collect a grab groundwater sample from the top of groundwater. On page 10, Apex states that soil samples will be collected from boring SB -13 from 40 ft bgs and every five feet to the top of groundwater. A proposed total depth of the boring was not stated, but was understood to be top of groundwater. During the second quarter 2020 monitoring event, depth to groundwater in Site wells ranged from 43.43 to 44.88 ft bgs. Apex further states that soil samples collected from 40 ft bgs, with the highest PID response, and from the bottom of the boring will be submitted for laboratory analysis. Based on the presented scope of work and current depth to water, only 2 soil samples will be collected (at 40 ft and at first water approximately 45 ft bgs), but Apex is proposing to submit 3 soil samples for laboratory analysis. On page 10, in the section discussing boring SB -14, Apex states that grab groundwater samples will be collected from first water and from "the deeper water zone", but does not specify proposed sample depths for either sample. On pages 10 and 11, Apex states that soil samples will be collected from boring SB -15 between 50 and 80 ft bgs, then states soil samples will be collected from 50 ft bgs every five feet to the top of current groundwater. During the second quarter 2020 monitoring event, depth to groundwater in Site wells ranged from 43.43 to 44.88 ft bgs, which is higher than the depth that which Apex proposed to start collection of soil samples (50 ft bgs). • On page 11, Apex states that the soil samples collected from 40 ft bgs,with the highest PID reading and from the bottom of the boring they will submit for